DFI Magazine July/August 2020 - 37

DFI S3 2020 | Virtual Conference Schedule* | Wednesday, August 5
All presentations are in Eastern Standard Time (EST)

11:00 a.m. - 11:05 a.m.

Conference Introduction
Roberto Lopez, P.E.
Malcolm Drilling Co. Inc. | Program Chair

Incorporating Deep Foundations in Limit-Equilibrium Slope Stability
Analyses: Revisiting Fundamentals and Seismic Applications

11:05 a.m.- 11:30 a.m.

Ben Turner, Ph.D., P.E.
Dan Brown and Associates, PC
Deep foundations are commonly used to prevent or stabilize existing landslides, deriving resistance
to slope movement through embedment in bearing material below the slide plane. A variety of
design methods are used in practice to incorporate piles into limit-equilibrium method slope stability analysis, some
of which fail to adequately capture the pile resistance mechanism or correctly identify the critical pile failure mode,
leading to false interpretation of factors of safety. Of particular concern is the common practice of assigning the shear
strength of the pile material, e.g., the shear strength of concrete or steel multiplied by the cross sectional area of the
pile, as a resisting force in slope stability analyses. Without performing separate laterally-loaded pile analyses, this
approach fails to identify whether shear failure is in fact the controlling pile mechanism; more often than not, analyses
show that the pile would actually fail in flexure prior to shear. As a result, the shear strength approach may drastically
overestimate the pile contribution to stability, inflating the calculated factor of safety.

11:30 a.m.- 12:30 p.m.

12:30 p.m.-12:45 p.m.
12:45 p.m.- 2:00 p.m.

Software Discussion
The following providers will analyze the problem using a variety of methods, present the solutions, and engage the
audience in a detailed Q&A session:
„ Itasca Consulting Group, Inc.
„ GREGORY GEOTECHNICAL
„ Rocscience, Inc.
„ Bentley/Soilvision/Plaxis

Break
Continuation of Software Discussion with Question and Answer Session
Panelists:

*Subject to Change

Varun Varun, Ph.D.
Itasca Consulting Group, Inc.

Garry Gregory, Ph.D., P.E., D.GE
GREGORY GEOTECHNICAL & OSU

Jeff Lam, M.Eng., P.Eng.
Rocscience, Inc.

Augusto Lucarelli, P.E.
Itasca Consulting Group, Inc.

Murray Fredlund, Ph.D., P.Eng
SoilVision Systems Ltd.

Sina Javankhoshdel, Ph.D., P.Eng.
Rocscience, Inc.



DFI Magazine July/August 2020

Table of Contents for the Digital Edition of DFI Magazine July/August 2020

Contents
DFI Magazine July/August 2020 - Intro
DFI Magazine July/August 2020 - Cover1
DFI Magazine July/August 2020 - Cover2
DFI Magazine July/August 2020 - Contents
DFI Magazine July/August 2020 - 4
DFI Magazine July/August 2020 - 5
DFI Magazine July/August 2020 - 6
DFI Magazine July/August 2020 - 7
DFI Magazine July/August 2020 - 8
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DFI Magazine July/August 2020 - AR1
DFI Magazine July/August 2020 - AR2
DFI Magazine July/August 2020 - AR3
DFI Magazine July/August 2020 - AR4
DFI Magazine July/August 2020 - AR5
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DFI Magazine July/August 2020 - AR16
DFI Magazine July/August 2020 - Cover3
DFI Magazine July/August 2020 - Cover4
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